Frankly, every US carrier receives some negative press. Post a thread about an airline and someone will come along and tell you 'horror' stories.
But I don't consider changing flight times, delays, etc 'horror' stories. They are just the reality of travel, and quite often the infrequent traveller doesn't understand that, and doesn't have perspective. I don't think that I have really ever read a 'horror' story here about airline travel, except for some things which a few of us have PMd about offline and chose not to post because they may make already nervous flyers more uneasy.
US Airways flight 1594 passengers certainly had their own horror stories, but in the end some may well fly US Airways again as there is some reassurance as to the training and ability of the employees.
All US carriers must abide by strict safety requirements; that is my number one criteria. Everything after that is secondary. I would choose an airline based on your personal priorities, including things such as
- routing
- schedule
- alliance partnership
- value for price paid (different from price)
- IFE
- Buy on board
- anything else which you personally consider important
Another example: 'bags lost'. That means the bags never arrived, ever. Much more common is 'delayed bags', but many here will post about how their bags were 'lost'. Truly lost bags are rare.
So honestly, filter out most of what you read online, especially from sites populated by mostly infrequent flyers. Read flyertalk.com and see what the people who fly your carrier day in and day out for years think. And even then, you may find that most of the 'complaints' have to do with things like the shrinking size of hot nut servings or half a can of pop vs a full can of pop. Not earth shattering complaints, in my book!
Edited to add: I 'know' the 4 people who posted above me and as a result value their opinion - nothing against the other posters (who had positive things to say) but I simply don't know them. But after reading posts from those four for years, I trust that they have balanced judgement and are reasonable posters.